XIAP antisense oligonucleotide (AEG35156) achieves target knockdown and induces apoptosis preferentially in CD34⁺38⁻ cells in a phase 1/2 study of patients with relapsed/refractory AML
XIAP, a potent caspase inhibitor, is highly expressed in acute myeloid leukemia (AML) cells and contributes to chemoresistance. A multi-center phase 1/2 trial of XIAP antisense oligonucleotide AEG35156 in combination with idarubicin/cytarabine was conducted in 56 patients with relapsed/refractory AM...
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Published in | Apoptosis (London) Vol. 16; no. 1; pp. 67 - 74 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Boston
Boston : Springer US
2011
Springer US |
Subjects | |
Online Access | Get full text |
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Summary: | XIAP, a potent caspase inhibitor, is highly expressed in acute myeloid leukemia (AML) cells and contributes to chemoresistance. A multi-center phase 1/2 trial of XIAP antisense oligonucleotide AEG35156 in combination with idarubicin/cytarabine was conducted in 56 patients with relapsed/refractory AML. Herein we report the pharmacodynamic studies of the patients enrolled at M. D. Anderson Cancer Center. A total of 13 patients were enrolled in our institution: five in phase 1 (12-350 mg/m² AEG35156) and eight in phase 2 (350 mg/m² AEG35156) of the protocol. AEG35156 was administered on 3 consecutive days and then weekly up to a maximum of 35 days. Blood samples were collected from patients on days 1 through 5 and on day 28-35 post-chemotherapy for detection of XIAP levels and apoptosis. AEG35156 treatment led to dose-dependent decreases of XIAP mRNA levels (42-100% reduction in phase 2 patients). XIAP protein levels were reduced in all five samples measured. Apoptosis induction was detected in 1/4 phase 1 and 4/5 phase 2 patients. Importantly, apoptosis was most pronounced in CD34 ⁺ 38 ⁻ AML stem cells and all phase 2 patients showing apoptosis induction in CD34 ⁺ 38 ⁻ cells achieved response. We conclude that at 350 mg/m², AEG35156 is effective in knocking down XIAP in circulating blasts accompanied by the preferential induction of apoptosis in CD34 ⁺ 38 ⁻ AML stem cells. |
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Bibliography: | http://dx.doi.org/10.1007/s10495-010-0545-1 |
ISSN: | 1360-8185 1573-675X |
DOI: | 10.1007/s10495-010-0545-1 |